Add test using global placeholders

test/Jamfile.v2

@@ -72,3 +72,4 @@ run mem_fn_fastcall_test.cpp ;
 run mem_fn_stdcall_test.cpp ;
 run bind_noexcept_test.cpp ;
 run bind_noexcept_mf_test.cpp ;
+run global_placeholders.cpp ;

test/global_placeholders.cpp

@@ -0,0 +1,22 @@
+// Copyright 2017, 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/bind.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+//
+
+int f( int a, int b, int c )
+{
+    return a + 10 * b + 100 * c;
+}
+
+int main()
+{
+    int const i = 1;
+
+    BOOST_TEST_EQ( boost::bind( f, _1, 2, _2 )( i, 3 ), 321 );
+
+    return boost::report_errors();
+}